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  <h2>{4}</h2>
  <p>
   The only possible values for the <c>{0} cells {1}</c> of the
   <b1>{3}</b1> are the <g>{0} values <b>{2}</b></g>.
   Because the number of possible values matches the number of cells,
   these <g>{0} values</g> must be located in these
   <c>{0} cells</c> in any order.
  </p>
  <p>
   <r>Other potential positions</r> of these values can therefore be
   removed from the <b1>{3}</b1>.
  </p>
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